Radon is a radioactive gas released by the breakdown of naturally occurring Uranium in the soil. Levels can vary from home to home depending on the amount of Uranium in the soil, the soil composition, construction methods, and even the weather. In the homes I’ve inspected, levels have ranged from 0.4 to 42.5 picocuries per Liter (pCi/L). The EPA recommends remediation at 4.0 pCi/L and above. According to the Kansas Radon Program, 25% of Kansas homes have high levels of Radon. Mitigation systems in our area usually consist of a 3″ PVC pipe installed in the concrete floor with a fan that pulls out radon and vents it outdoors. Mitigation costs generally range from $850 to $1,500. If levels come back above 4.0 pCi/L, sellers traditionally pay for mitigation system installation.